1. IAGA Resolution N2. (2021). Retrieved fromhttp://www.iaga-aiga.org/resolutions/resolution-no-2-2021-polar-cap-pc-index/
2. IAGA Resolution N3. (2013). Retrieved fromhttp://www.iaga-aiga.org/resolutions
3. Identification of the IMF sector structure in near-real time by ground magnetic data
4. The PC index: review of methods
5. Nielsen J. B. &Willer A. N.(2019).Restructuring and harmonizing the code used to calculate the definitive polar cap index report from DTU space. Retrieved fromhttps://tinyurl.com/sx3g5t5